From a548d7efe3ad963b95183d92c2841fde744cc373 Mon Sep 17 00:00:00 2001 From: Per Rosengren Date: Mon, 25 Aug 2025 23:05:30 +0200 Subject: Add Adc::new_with_clock() to configure analog clock Required on STM32WL with default HAL initialization. The function is only available for adc_g0, but all that have clock config should add implementations. --- examples/stm32wl/src/bin/adc.rs | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 examples/stm32wl/src/bin/adc.rs (limited to 'examples/stm32wl/src') diff --git a/examples/stm32wl/src/bin/adc.rs b/examples/stm32wl/src/bin/adc.rs new file mode 100644 index 000000000..118f02ae1 --- /dev/null +++ b/examples/stm32wl/src/bin/adc.rs @@ -0,0 +1,39 @@ +#![no_std] +#![no_main] + +use core::mem::MaybeUninit; + +use defmt::*; +use embassy_executor::Spawner; +use embassy_stm32::adc::{Adc, CkModePclk, Clock, SampleTime}; +use embassy_stm32::SharedData; +use embassy_time::Timer; +use {defmt_rtt as _, panic_probe as _}; + +static SHARED_DATA: MaybeUninit = MaybeUninit::uninit(); + +#[embassy_executor::main] +async fn main(_spawner: Spawner) { + let p = embassy_stm32::init_primary(Default::default(), &SHARED_DATA); + info!("Hello World!"); + + let mut adc = Adc::new_with_clock(p.ADC1, Clock::Sync { div: CkModePclk::DIV1 }); + adc.set_sample_time(SampleTime::CYCLES79_5); + let mut pin = p.PB2; + + let mut vrefint = adc.enable_vrefint(); + let vrefint_sample = adc.blocking_read(&mut vrefint); + let convert_to_millivolts = |sample| { + // From https://www.st.com/resource/en/datasheet/stm32g031g8.pdf + // 6.3.3 Embedded internal reference voltage + const VREFINT_MV: u32 = 1212; // mV + + (u32::from(sample) * VREFINT_MV / u32::from(vrefint_sample)) as u16 + }; + + loop { + let v = adc.blocking_read(&mut pin); + info!("--> {} - {} mV", v, convert_to_millivolts(v)); + Timer::after_millis(100).await; + } +} -- cgit